java实现简单TCP聊天程序

java实现简单TCP聊天程序

本文实例为大家分享了java实现TCP聊天程序的具体代码，供大家参考，具体UKbrfdx内容如下

服务端代码：

package com.testhttp://.server;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.net.ServerSocket;

import java.net.Socket;

public class Server {

public static void main(String[] args) {

new Server().startServer();

}

public void startServer(){

try {

//服务器在9990端口监听客户端的连接

ServerSocket ss = new ServerSocket(9999);

System.out.println("server is listening...");

while(true){

//阻塞的accept方法，当一个客户端连接上，才会返回Socket对象

Socket s = ss.accept();

System.out.println("a client has connected!");

//开启线程处理通信

new CommunicateThread(s).start();

}

} catch (IOException e) {

e.printStackTrace();

}

}

public class CommunicateThread extends Thread{

Socket socket;

DataInputStream dis;

DataOutputStream dos;

public CommunicateThread(Socket socket){

this.socket = socket;

try {

dis = new DataInputStream(socket.getInputStream());

dos = new DataOutputStream(socket.getOutputStream());

} catch (IOException e) {

e.printStackTrace();

}

}

@Override

public void run() {

super.run();

//读取客户端发过来的消息

String msg = null;

try {

while((msg = dis.readUTF()) != null){

System.out.println("client send msg ：" + msg);

String replyMsg = "server reply ： " + msg;

dos.writeUTF(replyMsg);

System.out.println("server reply msg ：" + replyMsg);

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

客户端代码：

package com.test.client;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.net.Socket;

import java.util.Scanner;

public class Client {

public static void main(String[] args) {

new Client().startClient();

}

public void startClient(){

try {

//连接到服务器

Socket socket = new Socket("localhost", 9999);

DataInputStream dis = new DataInputStream(socket.getInputStream());

DataOutputStream dos = new DataOutputStream(socket.getOutputStream());

Scanner scanner = new Scanner(System.in);

String line = null;

listenServerReply(dis);

while((line = scanner.nextLine()) != null){//读取从键盘输入的一行

dos.writeUTF(line);//发给服务端

System.out.println("client send msg : " + line);

}

} catch (Exception e) {

e.printStackTrace();

}

}

//监听服务端回复的消息

public void listenServerReply(final DataInputStream dis){

new Thread(){

@Override

public void run() {

super.run();

String line = null;

try {

while((line = dis.readUTF()) != null){

System.out.println("client receive msg from server: " + line);

}

} catch (IOException e) {

e.printStackTrace();

}

}

}.start();

}

}

先启动服务端，再启动客户端，在客户端的控制台输入消息并回车，就可以发送消息给客户端了，客户端收到消息后，马上会回复一个消息

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